Abstract: In oder to meet the needs of the low voltage-low power circuit application, a full differential amplifier operating at the 0.5V power supply with bulk inputs is introduced. A prototype was designed in a standard 0.18μm CMOS process using 0.5V threshold voltage devices. This amplifier uses the bulk driven as the input stage and the subthreshold operating device as the output stage. The two stages have their own local common mode feedback. Simulation results indicate that this amplifier has a 60dB DC gain, a 5.4MHz gain-bandwidth and consumes 138μW.

Key words: analog integrated circuits, bulk driven, weak inversion, operational amplifiers